jon-wei commented on a change in pull request #10056:
URL: https://github.com/apache/druid/pull/10056#discussion_r448611416



##########
File path: 
processing/src/main/java/org/apache/druid/query/filter/AbstractOptimizableDimFilter.java
##########
@@ -0,0 +1,40 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.druid.query.filter;
+
+import com.fasterxml.jackson.annotation.JsonIgnore;
+
+/**
+ * Base class for DimFilters that support optimization.
+ */
+abstract class AbstractOptimizableDimFilter implements DimFilter
+{
+  private Filter cachedOptimizedFilter = null;
+
+  @JsonIgnore
+  @Override
+  public Filter toOptimizedFilter()

Review comment:
       Ah, I was originally thinking of just letting the processing threads for 
non-joins possibly do some redundant computation (for joins, the pre-analysis 
would call toOptimizedFilter before the processing threads run the query), but 
I can adjust it.




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